PSKUDODIFFLDGIA GBACII.1S. 117 



The illustration by Archer in the ' Quart. Journ. 

 Micros. Sci.,' vol. ix, PI. xx, fig. 1 (Pleurophrys ? 

 sphserica) probably represents Ps'eudodifflugia Arclieri 

 as it measures 110 /A in length. 



2. Pseudodifflugia fulva (Archer) Penard. 

 (Plate L, figs. 10-13; PL LI, fig. -12.) 



Pleurophrys fulva 



ARCHER in Qrt. Jrn. Micr. Sci. (N. s.) X (1870), pp. 20, 122, pi. xx, 



f. 3; op. cit. (N. s.) XIII (1873), p. 437 ; in Proc. Dubl. Micr. Club, 



I, 5 (1872), pp. 355, 390, pi. xiii, f. 3 ; op. cit. II, 3 (1875), p. 285. 

 SCHULZE in Arch. mikr. Anat. XI (1875), pp. 124-125, pi. vii, ff. 2, 3. 

 Pseudodifflugia fulva 



PENARD in Rev. Suisse Zool. IX (1901), p. 238 ; Faune Rhiz. Leman 



(1902), pp. 451-452, 5 figs. ; Sarcodines in Cat. Invert. Suisse (1905), 



p. 91. 



HOPKINSON in Irish Natur. 1910, pp. 3, 4. 

 WAILES in Scott. Natur. 1912, p. 61 ; in Jrn. Linn. Soc., Zool. XXXII 



(1912), p. 126; in Naturalist, 1913, p. 140. 

 SCHMIDT in Arch. Protist. XXIX (1913), pp. 219-220, pi. v, ff. 17-20, 



Test light brown or yellow in colour, small, pyriform, 

 not compressed, covered with extraneous particles, 

 usually including a few large quartz-grains ; aperture 

 circular, terminal, devoid of neck ; nucleus placed pos- 

 teriorly, containing a single nucleole ; a single con- 

 tractile vesicle usually present; plasma not entirely 

 filling the test; pseudopodia long, attenuate, numerous, 

 straight or branched. 



Length 15-30/x,; diameter 12-20 /u,; aperture 6-1 2 //,. 



Habitat. Aquatic vegetation. 



ENGLAND. N. Yorkshire; Rutlandshire; Bucking- 

 hamshire ; Hampshire ; Isle of Wight ; Devonshire ; 

 Cornwall ; Scilly Isles. 



SCOTLAND. Outer Hebrides. 



IRELAND. Clare Island and Caher Island, Mayo ; 

 Inishbofin, Gal way; Wicklow (Archer}. 



Probably distributed generally in the British Isles, 

 but owing to its small size this species is easily over- 

 looked. Penard gives 15 to 23 /A as the usual limits of 

 length; Archer's figure measures about 30 /u, ; in the 



